Method of making glass-coated pipe coils



0d. 11, 1932. VON DEN STE|NEN 1,882,348

METHOD OF MAKING GLASS COATED PIPE COILS Original Filled Dec. 14. 1928 2Sheets-Sheet 1 m ll" III 15 gwuemlioz F1 3.5- fiusmv va/v new STE/IVE l15 6" 351* w I 14+ dump Oct. 11, 1932. G. VON DEN STEINEN 1,882,348

METHOD OF MAKING GLASS COATED PIPE COILS Original Filed Dec.- 14. 1928 2Sheets-Sheet 2 Patented Oct. 11 1932 UNITED STATES PATENT o Fic GUSTAVvoN mm srnmnn, or CLEVELAND'HEIGHTS, onro, AssIGnoR TO THE GLASCOTECOMPANY, or EUCLID, OHIO, A CORPORATION or 01110.

METHOD OF MAKI NG GLASS-COATED PIPE COILS =Original application filedDecember 14, 1928, Serial No. 326,027. Divided and. this applicationfiled November 10, 1930. Serial No. 494,511.

This invention relates generally to the application of vitreous or fusedcoatings to articles, and relates more particularly to, a method I formaking pipe coils having such coatings.

This application isla divisionofvmy copending application Serial No.326,027, filed December 1 1, 1928, in Which is claimed apparatus andstructure illustrated and described herein.

In coating a coil or other article with glass it is customary to applythe coating material in the form of a powder or spray, and then 7 heatthe article in a furnace to approximately 1800 F., atwhich temperaturethe powder is fused and converted into an impervious coating. At thistemperature steel, and other available metals from-which a pipe coilmight be constructed, become sosoft that v it is a difficult problem tosupport the coil during th coating process so that it willreta n its notcome in contact. with the supporting vide a novel method of making glasscoate'd pipe coils in which the coil is suspend-ed and held againstdistortion during the fusing of the coating material.

A further object of this invention to-provide a novel method of makingglass-coated pipe coils which includes suspending a c011 within a framein such a manner as to prevent distortion of the coil andthen heatingthe frame and the coil suspended therein to fuse the coating material. VL Other objects and advantages of tlns 1nvention will be apparent'fromthe followmg description taken in connection with the ac companyingsheets of drawings, in which Fig. 1 is a plan View illustrating mymethod of making glass-coatedcoils.

Fig. 2 is a sectional view taken substantially on line 2 2 of Fig. 1.

Fig. 3 is a sectional View of a was be coated, taken on line 3-3 of Fig.2.

Fig. is a detail section, taken on line 44 of Fig. 2, illustrating themanner of holding and supporting the central column of a coil accordingto my method.

Fig; 5 is a detail elevationillustrating the manner of holdingandsupportingthe convolutions of a coil according to my method. Fig. 6 is across-section, taken on line6.6 of Fig. 5, showing one of thecoilsupporting nipples, and V .7

Fig. 7 isan elevation showingv a plug for closingthe supporting nipplesof the end convolutions. t t

in the drawn] gs, to which detailed reference wlll now be made, Ihavellustrated the nanher of carrying out method whereina coil 10 to beglass-coated is supported and held within a frameworkll so as topreventdistortion of the coil or contact ofv the latter with the supportingmeans.

Before proceeding with a detailed description of the coil supportingmeans whichI prefer to emplo, it should be understood that my method maybe advantageously used n making glass-coated pipe coils of variousshapes and forms, but; for purposes of illustration, the coil in thisinstance is formed from 'two lengths of pipe bent to helical form, asindicated at 12 and 13, and arranged so that the convolutions of onehelix alternate with the convolutions of the other helix, thus providingtwo separate paths. of flow through theicoil. To admit fluid to coil 10to provide a substantially rigid connection for centrally supporting thecoil during the coating process, as will be more fully disclosedhereinafter. The upper ends of helical coils 12 and 13 are connectedatpoints 180 apart, as shown'in Fig. 4, to a. discharge fitting 16,which I prefer to construct in the form of a sleeve, arrangedconcentrically with column 14 and welded to the upper portion thereof.The diameter of the sleeve 16 is materially larger than the diameter .ofcolumn 14 and of the supply pipe leading to column 14, so that the space17, between sleeve 16 and the supply pipe, will serve as a dischargepassage for .coil 10. To facilitate'the welding of the sleeve 16 tothe'column '14 the wall of the lower end portion 16 'of'the sleeve isflanged or bent inwardly to circumferentially engage the column 14,while at the opposite end of the sleeve 16 I provide an annular enlargedportion 18, by which the coil may be attached to the apparatus withwhich it is to be used, and to which a discharge connection may beconveniently I applied.

For rigidly supporting the coil during the coating process I provide theframework 11, composed of members welded or otherwise securely fastenedtogether to form a base {portion 19, having uprights 20 upon which i'a'nannular member 21 is mounted.

beam 22 extends diametrically .across annu- A crosslar member 21 andcarries a tubular projection 23 welded thereto from which coil 10 issuspended With its axis in alignment with the axis of the projection.Adjacent its free "end projection 23 carries a removable pin 24 whichextends diametrically through the walls of the projection. In order tosupport about its perimeter.

the coil at its center a piece of pipe 25 is connected to the nipple 15of the column 14 as by means of a pipe coupling 26. When the upper end.of pipe 25 is slipped over the projection 23 perforations provided inpipe '25 register with the perforations of the proection so as to admitthe pin 24 which couples the parts together.

For supporting the coil about its perim'- eter I provide a carrier 26which includes a flanged coil supporting member or ring 27 to which thecoil is connected at spaced points This supporting ring 27 is carried bya central hub 28 to which it is connected by bars 29 extending radially5 outwardly from the hub and having at their outer ends hooks 30 whichengage the lower flange of ring 27- and are welded thereto. The hub 28is of suitable diameter to permit it to he slipped over pipe 25 and isprovided with aligned slots 31 which register with the perforations ofpipe 25 and of projection 23 to receive'pin 24 upon which the hub issupported. At the top of thecoil as seen in Fig. 2, at p ints pace ab uits perimeter, 'I provide internally threaded nipples shape.

32 which are welded to the convolutions at one end of the coil.Supporting rods 33 are provided for connecting the coil to supportingring 27 and have one end threaded and screwed into nipples 32. At theiropposite ends rods 33 are welded to ring 27 and to the hooks 30 of bars29. Notches are preferably cut in the lower flange of ring 27 to receivethe rods 33 to permit them to be welded to the web of ring 27 along aportion of their length.

To make the coil a substantially rigid unit and to prevent sagging anddistortion of its convolutions, spacers 34 are welded between adjacentconvolutions and arranged in rows extending-axially of the coil. Thenipples 32 are arranged in alignment with the rows of spacers sothat theconvolutions are supported from the member 27 by the rods 33. The column14, which extends substantially coaX-ially of the coil, connects andsupports the end convolu-tions thereof, and adds materially tother'igidity of the coil as a unit.

After the coil has been attached to the ring 27 and suspended from theframe 11, the coating material is applied to the entire surface of thecoil including the spacers 34, the nipples 32 and the column 14. Thesupporting frame and the suspended coil are then heated, preferably bybeing placed in a furnace which-is brought to the temperature necessaryto fuse the coating material.

After cooling, the coil is removed from the frame by withdrawing pin 24and is disconnected from supporting ring 27 by cutting rods 33. The stubends of rods '33 are unscrewed from nipples '32, and plugs 35 are thenscrewed into these nipples and sealed with litharge or other suitablematerial When the supporting frame and the coil are heated to the hightemperature necessary to fuse the coating material, the metal of thesupporting frame loses its rigidity and its members tend to buckle andtwist out of However, by my methed of constructing and uniformlysupporting the coil as a substantially rigid unit, the distortion "andtwisting of themembers of the supporting frame can have no deleteriousefi'ect on 14, connected to the projection '23, affords a centralsupport and also tends to rigidly maintain the coil and the convolutionsthere of n proper alignment.

'Moreover it will be notedthat according;

to my method the coil and the carrier 26' are connected together at aplurality of points around the perimeter of the coil so that the carriertends to prevent any lateral deflection or swaying of the lower end ofthe coil relative to the axis thereof. The carrier in turn is connectedat its center to the frame by a single connection which is on the axisof the coil so that when the frame members buckle or twist any movementof the coil relative to the frame will in fact be movement of the coilas an entirety and of the coil and carrier as a unit, and will not be amovement of one portion of the coil relative to another portion thereof.

While I have referred, in this specification and also in the claims, toa glass-coated coil, it will be understood that the invention is notlimited to coatings that come within the technical term glass, and thatI use the term glass-coated in the broader sense in which it means anyvitreous or fused coat- It is also to be understood that I do not intendto limit my invention to the particular arrangements and steps ofprocedure herein shown and described, but regard my invention asincluding such changes as fall within the scope of the appended claims.

Having thus described my invention, I claim:

1. The method of making glass-coated pipe coils which comprisessuspending a coil within a supporting frame so as to retain its normalshape, applying coating material to the external surface of said coil,and then heating said coil and supporting frame to the temperaturerequired to fuse said material.

2. The method of making glass-coated pipe coils which comprisessupporting a coil centrally thereof and also at spaced points havingconvolutions and spacers between adjacent convolutions, attachin acarrier to said coil at points aligned wit said spacers, suspending saidcarrier and coil in a supporting frame, applying coating material tosaid convolutions and spacers, and then heating said coil while thussupported to fuse said material.

6. The method of making lass-coated pipe coils which comprises attachinga coil to a carrier at a plurality of points spaced around the perimeterof the coil, suspending the carrier in a supporting frame by attachingthe carrier to the frame at a single point in alignment with the axis ofthe coil, applying coating .material to the coil, and then heating thecoil and frame assembly to fuse the coating material. 7

In testimony whereof, I hereunto aflix my signature.

GUSTAV VON DEN STEINEN.

about its perimeter, applying coating mat-erial to the external surfaceof said coil, and then heating the coated coil while thus sup ported tothe temperature required to fuse said material.

3. The method of making glass-coated pipe coils which comprisesattaching a coil to a supporting structure at a lurality of pointswhereby said coil is uni ormly supported and held against distortionfrom its normal shape, applying coating material to the external surfaceof said coil, and then

